Member Since: 01 May 2019
Location: Nice
Posts: 88
Whilst I'm not as expert as Robbie, I'd think that if you take source from the same logical points (cornering? - typing whilst away) then it should be all fine?
49/50 fuse is adaptive front light left/right and are plugged into respectively 24/25 which are left/right side lamps front/tail (front and tail are on the same fuse, left/right are separated).
One important detail noticed there is that 24/25 are 10amps and 49/50 are 5amps - worth noting.
Hope this helps.
5th Sep 2019 7:30 pm
betty02
Member Since: 09 Jun 2014
Location: Wakefield
Posts: 133
Robbie wrote:
Made a couple of patch leads to provide a fused feed to the left and right lights, which also restores normal parking light function:
Click image to enlarge
Installed in the CJB:
Click image to enlarge
I've left the modification so that it triggers the front & rear LEDs from the unlock command, but it takes 2 minutes to change them to ignition switched or to revert to standard.
I don't have a D4 yet... but I already have some facelifted Xenon lights to go on if it doesn't come with them.
I simply need to make 2 of the above wires with a 10a fuse each end and plug into the fuse you've labelled on the wires? Seems oh so simple... I have doubt
6th Sep 2019 9:53 am
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
I'll sound like a broken record - 49/50 side is 5 amps, not 10 amps.
I'd strongly suggest to stick to that 5 amps on that side. It is 5 amps (meaning fuse will break at 5 amps) and not 10 amps (stronger current) to protect the equipment behind.
9th Sep 2019 9:23 pm
betty02
Member Since: 09 Jun 2014
Location: Wakefield
Posts: 133
Yes apologies I did read that numerous time! Now I just need to find a 5amp breakout fuse!!
9th Sep 2019 9:57 pm
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
If you find one, let us know. I went to the wotnots web site and their lowest rated Fuse with breakout is 10 Amp. The alternative side mounted possibly won’t work as you may not be able to get 2 in next to each other in the correct orientation.
10th Sep 2019 8:22 am
betty02
Member Since: 09 Jun 2014
Location: Wakefield
Posts: 133
No look finding anything last night. Will have another gander this morning
10th Sep 2019 8:55 am
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
It’s looking likely the reason Robbie went for 10a breakout fuses is because they don’t make a 5.
10th Sep 2019 9:58 am
betty02
Member Since: 09 Jun 2014
Location: Wakefield
Posts: 133
Bussman look like they may have a potential! Not sure how safe it would be?
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
lrovy wrote:
I'll sound like a broken record - 49/50 side is 5 amps, not 10 amps.
I'd strongly suggest to stick to that 5 amps on that side. It is 5 amps (meaning fuse will break at 5 amps) and not 10 amps (stronger current) to protect the equipment behind.
This is a fundamental but common misunderstanding.
The fuses play no role in protecting the equipment behind them. Indeed, the device behind the fuse may even be the point of failure that causes the current to rise beyond safe levels.
More explanation, if interested:
The fuses exist to protect the wiring - nothing else. The fuse rating is selected in order to break the circuit before the wiring it protects hits unsafe temperature levels. The current required to actually melt the fuse is also considerably greater than the rated value. The actual current required to damage the wiring depends on many factors, arguably the most significant of which is the gauge of the wiring.
Same goes for domestic electrics. If you take the most simple of domestic services - say a direct radial circuit from a Consumer Unit direct to an electric oven, you would probably find that it is served by a 32 amp Circuit Breaker, but:
- the oven does not receive any 'protection' from the CB
- the oven does not required 32 amps (that would be around 8000 W)
- the CB actually trips at 3 to 5 times the rated value (say 150 Amps, or around 37500 W)
The electrician that installs and certifies the circuit above has not lost his marbles and will be considering wiring gauge, insulation type, bundle density, environment, orientation and diversity. The electrician does not really care about the actual device at the end of the circuit or even know what it will be.
Above all, if you doubt my competency, methodology or testing then please do not install this modification.
I could be anybody, even a kid sat in my mum's basement eating crisps.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 09 Jun 2014
Location: Wakefield
Posts: 133
Thanks for that! Really need to make sure I get a 5amp breakout fuse then
10th Sep 2019 11:56 am
Davethegeo
Member Since: 01 Oct 2015
Location: Edinburgh
Posts: 879
Remarkably accurate advice for a crisp-eating kid.D1 300Tdi - gone
D2 Td5 ES (Alive remapped...mmm) - sadly gone
D4 2012 SDV6 XS - Stolen
D4 2014 SDV6 HSE - Shiny
10th Sep 2019 12:10 pm
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
Robbie, you're right on "to protect equipment behind". I'm not sure right now it there's just a "bulb" as "equipment" or anything else, like a sensor or something to detect that bulb is broken. If there's more than a single element installed one after another on the line, then shortcut at a position which would cause high amperage to go though could cause a risk to not only "equipment" but also the wiring. Not sure what's the power/current rating "equipment" is designed to survive and for sure cabling should survive way higher one.
It is just common sense to use 5amps fuse as original one and not 10amps and everyone does modification under their own responsibility. It is more about the fact that installing 10amps one in place of 5amps poses risk that if something goes south then it is double the current which will go through and preference is to not take a risk.
signed by Kiddo, eating popcorn whilst sitting on mum's naps
ok, kidding - really appreciate all your help and idea with the mod.
10th Sep 2019 11:39 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I guess my common sense was limited to that shown on the first page of the thread - the parts where I studied the wiring diagrams, taking note of all the relevant circuits, protections and wiring gauge and the wiring lengths.
From there I planned various options on how to modify the circuit and judge what protections would now be required. Following that came the down-selection of a prime candidate for testing. After that came the selection of the new parts required.
Once installed the new circuit was tested for power, ground and current draw, in all vehicle modes.
Honestly, guessing what may or may not be in the circuit and what fuse should be used just didn't occur to me.Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 261
lrovy wrote:
Robbie, you're right on "to protect equipment behind". I'm not sure right now it there's just a "bulb" as "equipment" or anything else, like a sensor or something to detect that bulb is broken. If there's more than a single element installed one after another on the line, then shortcut at a position which would cause high amperage to go though could cause a risk to not only "equipment" but also the wiring. Not sure what's the power/current rating "equipment" is designed to survive and for sure cabling should survive way higher one.
It is just common sense to use 5amps fuse as original one and not 10amps and everyone does modification under their own responsibility. It is more about the fact that installing 10amps one in place of 5amps poses risk that if something goes south then it is double the current which will go through and preference is to not take a risk.
signed by Kiddo, eating popcorn whilst sitting on mum's naps
ok, kidding - really appreciate all your help and idea with the mod.
So how did you use two bussmann bp/hhh connectors next to each other in the CJB, surely one would have to have been turned by 180 degrees?
Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
11th Sep 2019 8:23 am
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
That’s the reason I didn’t use those, putting one in upside down would mean the new circuit drawing power through the lower rated fuse.
I would have preferred a 5amp with breakaway but as they don’t appear to make them, I went with Robbie 10amp method. Lots (Both Disco and RRS) have done this mod in the 2 or 3 years since and many never make comment and I’m sure someone would be back here in heartbeat if it all went wrong.
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